.post2 {
  margin-left: 1%;
  margin-bottom: 10px;
}

.sec_2{
  text-align: center;
  margin-bottom: 20px;
}

.sec_2 .fenlei{
  color: white;
  display: inline-block;
  width: 100px;
  height: 100%;
  border: 1px solid;
  text-align: center;
  cursor: pointer;
  margin-left: 10px;
}
@media (max-width: 991px){
  .post2{
    width: 98%;
  }
}